-
100
Democritus
400 B.C. - proposed the concept of the atom -
402
Aristotle
Influential in the rejection of the concept of the atom -
Antoine Lavosier
He recognized and named oxygen (1778) and hydrogen (1783) and opposed the phlogiston theory. -
Claude Louis Berthollet
He was the 1st person to introduce the use of chlorine as bleach -
John Dalton
He discovered that all matter is composed of extremely small particles called atoms. -
Joseph Proust
He was best known for his discovery of the law of constant composition, stating that chemical compounds always combine in constant proportions -
Amadeo Avagardo
He is best known for his hypothesis that equal volumes of different gases contain an equal number of molecules, provided they are at the same temperature and pressure. -
Johann Wilhelm
He made the observation that invisible rays just beyond the violet end of the visible spectrum were especially effective at lightening silver chloride-soaked paper. -
Sir Humphry Davy
He proved that electricity transforms chemicals. -
Pierre Jean Robiquet
Dsicovered caffiene -
William Crookes
Discovered the Cathode Ray. Radiation going threw tubes -
Max Planck
Invented the Quantum theory -
Madame Curie
Dsicovered Radium and Polonium -
Dmitri Mendeleev
Made the 1st peridoic table of elements https://www.youtube.com/watch?v=Zg6KeXsDVwY -
Ira Remsen
Developed teh 1st artificial sweetner -
Louis Pasteur
Created the 1st ever vaccine -
Niels Bohr
He proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another. -
James Chadwick
Discovered the Neutron -
Henri Becquerel
He was using naturally fluorescent minerals to study the properties of x-rays -
Henri Becquerel
He 1st discoered radioactivity -
Ernest Rutherford
He mad discoveries in the fields of radioactivity and nuclear physics. He discovered alpha and beta rays, set forth the laws of radioactive decay, and identified alpha particles as helium nuclei. -
J.J Thomson
Discovered the electron -
Leo Hendrik Baekeland
Developed the 1st plastic -
Robert Milikan
Measured the single charge of an electron -
Henry Moseley
He found that certain lines in the X-ray spectrum of each element moved the same amount each time you increased the atomic number by 1. -
Albert Einstein
Created the theory of relavtivity -
Werner Heisenberg
discovered a way to formulate quantum mechanics in terms of matrices. -
erwin schrödinger
He combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom. -
Alexander Fleming
He invented Penicillin -
Louis de Broglie
Discovered the wave nature of Electrons -
Wallace Carothers
Discovered nylon -
Frederick Sanger
Discovered the the structure of insulin
